KR20160033368A - Cellulose ester film with excellent peeling-off property - Google Patents
Cellulose ester film with excellent peeling-off property Download PDFInfo
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- KR20160033368A KR20160033368A KR1020140123926A KR20140123926A KR20160033368A KR 20160033368 A KR20160033368 A KR 20160033368A KR 1020140123926 A KR1020140123926 A KR 1020140123926A KR 20140123926 A KR20140123926 A KR 20140123926A KR 20160033368 A KR20160033368 A KR 20160033368A
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- 229920002678 cellulose Polymers 0.000 title claims abstract description 23
- 238000006467 substitution reaction Methods 0.000 claims abstract description 27
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims abstract description 17
- 125000002252 acyl group Chemical group 0.000 claims abstract description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 7
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 claims abstract description 6
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 claims abstract description 5
- 239000010408 film Substances 0.000 description 51
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 244000194101 Ginkgo biloba Species 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- G—PHYSICS
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Abstract
본 발명은 박리성이 우수한 셀룰로오스 에스테르 필름에 관한 것으로서, 보다 상세히는, 하기 식(1) 내지 (3)을 만족하는 것을 특징으로 하는 셀룰로오스 에스테르 필름이다. 본 발명의 목적은 VA 모드용으로 사용할 정도의 높은 복굴절성을 가지면서도, 박리성이 매우 우수한 효과가 있다.
식(1): 0.1≤X≤0.3
식(2): 0.3≤Y≤0.7
식(3): 1.0≤Z≤2.6
단, X는 부틸기의 치환 범위를 나타낸다. Y는 치환되지 않은 Hydroxyl기의 치환 범위이며, Z는 아세틸기와 프로피오닐기등 부틸기를 제외한 아실기의 치환 범위를 나타낸다.The present invention relates to a cellulose ester film excellent in peelability, and more particularly, to a cellulose ester film characterized by satisfying the following formulas (1) to (3). It is an object of the present invention to provide an excellent peeling property while having a high degree of birefringence to be used for a VA mode.
(1): 0.1? X? 0.3
(2): 0.3? Y? 0.7
(3): 1.0? Z? 2.6
Provided that X represents the substitution range of the butyl group. Y is a substitution range of an unsubstituted hydroxyl group, and Z is a substitution range of an acyl group excluding a butyl group such as an acetyl group and a propionyl group.
Description
본 발명은 박리성이 우수한 셀룰로오스 에스테르 필름에 관한 것이다.The present invention relates to a cellulose ester film excellent in peelability.
액정 표시 장치의 시야각과 색감 변화 개선을 위해 특정 리타데이션값을 갖는 위상차 필름 및 그 조합이 이용되고 있고, 이러한 위상차 필름의 주원료로는 셀룰로오스 에스테르가 널리 사용되고 있다.In order to improve the viewing angle and color change of the liquid crystal display device, a retardation film having a specific retardation value and a combination thereof are used. Cellulose ester is widely used as the main raw material of such a retardation film.
셀룰로오스계 필름이 특정 리타데이션값을 갖도록 하는 요인으로는 여러 요소가 있지만, 그 중에서도 셀룰로오스 에스테르의 아실기 치환도에 크게 의존하는 것으로 알려져 있다.There are various factors that cause the cellulose-based film to have a specific retardation value, but it is known that the cellulose ester film largely depends on the degree of substitution of the acyl group of the cellulose ester.
예를들어, 낮은 치환도의 셀룰로오스 에스테르 필름은 그 고유 복굴절이 높기 때문에 치환도를 저감함으로써 VA 용 위상차 필름으로 적절한 높은 광학 발현 성을 실현하는 것이 가능할 수 있다.For example, a cellulose ester film having a low degree of substitution can have a high degree of intrinsic birefringence, so that the degree of substitution can be reduced, so that it is possible to realize appropriate high optical performance as a VA retardation film.
VA용에 적절한 광학 발현을 얻으려면(특히, VA 모드에 사용되는 광학보상필름 (위상차 필름)은 높은 리타데이션 값 (광학이방성)을 요구하게 되는데, 통상적으로, 20~200㎚의 Re 리타데이션 값과 60~300㎚의 Rth 리타데이션 값 정도가 요구된다), 셀룰로오스 에스테르의 아실기 치환도를 낮출 필요가 있지만, 셀룰로오스 에스테르의 아실기 치환도를 낮추면 히드록시기의 증가에 의한 수소 결합 성분이 증가하기 때문에, 공정 중의 스틸 밸트(Steel Belt)와의 수소 결합이 일어나 박리성이 매우 저하되는 문제점이 발생한다.In order to obtain appropriate optical expression for VA (in particular, an optical compensation film (phase difference film) used in the VA mode requires a high retardation value (optical anisotropy), the Re retardation value of 20 to 200 nm And a Rth retardation value of 60 to 300 nm are required), it is necessary to lower the degree of substitution of the acyl group of the cellulose ester. However, if the degree of substitution of the acyl group of the cellulose ester is lowered, the hydrogen bonding component due to the increase of the hydroxyl group is increased , Hydrogen bonding with the steel belt in the process occurs, and the peelability is very low.
필름과 스틸 밸트와의 박리성 문제에 대한 종래의 기술은 하기 특허문헌 1을 예시하여 설명할 수 있다. 특허문헌 1은, 용융 밀어내진 열가소성 수지 필름을 금형 롤로 금속제 무단 벨트로 압압함으로써, 상기 열가소성 수지 필름 표면에 미세 구조를 형성하는 광학 필름의 제조 방법이며, 상기 열가소성 수지의 유리 전이 온도를 Tg로 했을 때에, Tg+40℃의 온도에 있어서의 상기 금속제 무단 벨트로 열가소성 수지 필름과의 동마찰 계수가 0.3 이하이고, 상기 금속제 무단 벨트의 표면의 표면 거칠기 Ra가 0.2㎛이하인, 광학 필름의 제조 방법의 제조방법으로서, 벨트의 표면 성질을 개선함으로써, 박리성(peel-off) 문제를 해결하고 있다.Conventional techniques for the problem of peelability between a film and a steel belt can be explained by exemplifying the following Patent Document 1. Patent Document 1 discloses a method for producing an optical film that forms a microstructure on the surface of the thermoplastic resin film by pressing a melt-extruded thermoplastic resin film with a metal roll with an endless metal belt, wherein the glass transition temperature of the thermoplastic resin is defined as Tg Wherein said metallic endless belt at a temperature of Tg + 40 占 폚 has a coefficient of dynamic friction with the thermoplastic resin film of 0.3 or less and a surface roughness Ra of the surface of said metallic endless belt of 0.2 占 퐉 or less As a manufacturing method, the problem of peel-off is solved by improving the surface property of the belt.
본 발명의 목적은 VA 모드용으로 사용할 정도의 높은 복굴절성을 가지면서도, 박리성이 매우 우수한 셀룰로오스 에스테르 필름을 제공하고자 함이다.It is an object of the present invention to provide a cellulose ester film which has a high degree of birefringence to be used for a VA mode and is excellent in peelability.
본 발명은 상술한 종래 기술의 문제점을 해결하기 위해 안출된 것으로서,SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art,
하기 식(1) 내지 (3)을 만족하는 것을 특징으로 하는 셀룰로오스 에스테르 필름을 제공한다.The cellulose ester film satisfying the following formulas (1) to (3).
식(1): 0.1≤X≤0.3(1): 0.1? X? 0.3
식(2): 0.3≤Y≤0.7(2): 0.3? Y? 0.7
식(3): 1.0≤Z≤2.6(3): 1.0? Z? 2.6
단, X는 부틸기의 치환 범위를 나타낸다. Y는 치환되지 않은 Hydroxyl기의 치환 범위이며, Z는 아세틸기와 프로피오닐기등 부틸기를 제외한 아실기의 치환 범위를 나타낸다.Provided that X represents the substitution range of the butyl group. Y is a substitution range of an unsubstituted hydroxyl group, and Z is a substitution range of an acyl group excluding a butyl group such as an acetyl group and a propionyl group.
본 발명에 있어서, 필름의 박리력(Fp)는 20gf/in2 미만인 것을 특징으로 하는 셀룰로오스 에스테르 필름을 제공한다(여기서, Fp는 온도 35℃이하, 상대습도 55%RH 이하, 환경에서 필름이 스틸 밸트로부터 박리되는 시점의 박리력을 말한다). In the present invention, there is provided a cellulose ester film wherein the peeling force (Fp) of the film is less than 20 gf / in 2 (wherein Fp is a film having a film thickness Quot; refers to the peeling force at the time of peeling from the belt).
본 발명에 있어서, 식(5)와 식(6)으로 표현되는 두께방향(Rth)으로 90~300 nm, 면방향(Ro)은 40~200nm의 위상차를 만족하는 것을 특징으로 하는 셀룰로오스 에스테르 필름을 제공한다.In the present invention, a cellulose ester film characterized by satisfying a retardation in a thickness direction (Rth) of 90 to 300 nm and a retardation (Ro) in a thickness direction of 40 to 200 nm represented by the formulas (5) and (6) to provide.
식(5) Rth={(nx+ny)/2-nz}×d (5) Rth = {(nx + ny) / 2-nz} xd
식(6) Ro=(nx-ny)×d, (6) Ro = (nx-ny) x d,
(단,d는 필름의 두께(nm), nx은 필름의 면내의 최대의 굴절율, ny은 필름 면내에서 nx에 직각인 방향의 굴절율, nz은 두께 방향에 있어서 필름의 굴절율이고, 각각 23℃, 55%RH의 환경하에서 파장 550nm로 측정한 값이다)(Where d is the thickness of the film in nm), nx is the maximum refractive index in the plane of the film, ny is the refractive index in the direction perpendicular to nx in the film plane, and nz is the refractive index of the film in the thickness direction, 55% < / RTI > RH)
본 발명에 있어서, 필름의 용도는 VA 모드용인 것을 특징으로 하는 셀룰로오스 에스테르 필름을 제공한다.In the present invention, there is provided a cellulose ester film characterized in that the use of the film is for a VA mode.
본 발명의 목적은 VA 모드용으로 사용할 정도의 높은 복굴절성을 가지면서도, 박리성이 매우 우수한 효과가 있다.It is an object of the present invention to provide an excellent peeling property while having a high degree of birefringence to be used for a VA mode.
도 1은, 본 발명 실시예 및 비교예들의 박리력 측정에 사용된 측정 기기 및 측정 조건을 도시한 것이다.
도 2는, 본 발명 실시예 및 비교예들의 박리력 측정과정의 스킴을 나타낸 것이다.Fig. 1 shows a measurement instrument and measurement conditions used in the peeling force measurement of the examples and comparative examples of the present invention.
FIG. 2 shows the scheme of the peeling force measurement process of Examples and Comparative Examples of the present invention.
이하, 본 발명에 대하여 상세히 설명한다.
Hereinafter, the present invention will be described in detail.
본 발명은,According to the present invention,
하기 식(1) 내지 (3)을 만족하는 것을 특징으로 하는 셀룰로오스 에스테르 필름이다.Is a cellulose ester film characterized by satisfying the following formulas (1) to (3).
식(1): 0.1≤X≤0.3(1): 0.1? X? 0.3
식(2): 0.3≤Y≤0.7(2): 0.3? Y? 0.7
식(3): 1.0≤Z≤2.6(3): 1.0? Z? 2.6
여기서, X는 부틸기의 치환 범위를 나타낸다. Y는 치환되지 않은 Hydroxyl기의 치환 범위이며, Z는 아세틸기와 프로피오닐기등 부틸기를 제외한 아실기의 치환 범위를 나타낸다.Here, X represents the substitution range of the butyl group. Y is a substitution range of an unsubstituted hydroxyl group, and Z is a substitution range of an acyl group excluding a butyl group such as an acetyl group and a propionyl group.
특히, 상기 식에서 X 범위 즉, 부틸기의 치환 범위가 매우 중요하다. 부틸기는 셀룰로오스 에스테르 수지와 스틸 밸트 표면 간의 상호작용 즉, 수소결합이나 반데르발스력(Van der Waals Force) 형성을 방해하여, 박리가 용이하도록 하는 역할을 하기 때문이다.Particularly, in the above formula, the X range, that is, the substitution range of the butyl group is very important. The butyl group interferes with the interaction between the cellulose ester resin and the surface of the steel belt, that is, the formation of hydrogen bond or van der Waals force, thereby facilitating the peeling.
본 발명에 있어서, 필름의 박리력(Fp)는 20gf/in2 미만인 것을 특징으로 한다. 여기서, Fp는 온도 35℃이하, 상대습도 55%RH 이하, 환경에서 필름이 스틸 밸트로부터 박리되는 시점의 박리력을 말한다.In the present invention, the peel force (Fp) of the film is characterized by being less than 20 gf / in 2 . Here, Fp refers to the peeling force at the time when the film is peeled from the steel belt in the environment at a temperature of 35 DEG C or less and a relative humidity of 55% RH or less.
본 발명의 필름은 광학적 특성이 매우 좋으며, 식(5)와 식(6)으로 표현되는 두께방향(Rth)으로 90~300 nm, 면방향(Ro)은 40~200nm의 위상차를 만족하는 것을 특징으로 한다. The film of the present invention has a very good optical property and is characterized by satisfying a retardation of 90 to 300 nm in the thickness direction (Rth) and a retardation in the plane direction (Ro) of 40 to 200 nm expressed by the formulas (5) .
식(5) Rth={(nx+ny)/2-nz}×d (5) Rth = {(nx + ny) / 2-nz} xd
식(6) Ro=(nx-ny)×d, (6) Ro = (nx-ny) x d,
여기서, d는 필름의 두께(nm), nx은 필름의 면내의 최대의 굴절율, ny은 필름 면내에서 nx에 직각인 방향의 굴절율, nz은 두께 방향에 있어서 필름의 굴절율이고, 각각 23℃, 55%RH의 환경하에서 파장 550nm로 측정한 값이다.Ny is the refractive index in the direction perpendicular to nx in the film plane and nz is the refractive index of the film in the thickness direction and is 23 DEG C and 55 DEG C, respectively, where d is the thickness of the film in nm, nx is the maximum refractive index in the plane of the film, % RH under a wavelength of 550 nm.
특히, 본 발명의 필름은, 광학적 복굴절성이 높아, 필름의 용도는 VA 모드용으로 사용되기에 적합하다.
In particular, the film of the present invention has high optical birefringence, and the use of the film is suitable for use in the VA mode.
이하, 본 발명에 대하여 실시예를 들어 보다 더 상세히 설명한다. 이하의 실시예는 발명의 상세한 설명을 위한 것일 뿐, 이에 의해 권리범위를 제한하려는 의도가 아님을 분명히 해둔다.
Hereinafter, the present invention will be described in more detail by way of examples. It is to be understood that the following embodiments are for the purpose of illustration only and are not intended to limit the scope of the present invention.
실시예Example 1 One
셀룰로오스 아세테이트 부틸레이트(부틸기 치환도 0.18, 아세틸기 치환도 2.25, 하이드록시기 치환도 0.57), 및 용매(메틸렌클로라이드:메탄올=9:1)을 믹싱 탱크에 넣고 교반하여 완전히 용해시킨다.Cellulose acetate butyrate (butyl group substitution degree: 0.18, acetyl group substitution degree: 2.25, hydroxyl group substitution degree: 0.57) and solvent (methylene chloride: methanol = 9: 1) are placed in a mixing tank and completely dissolved by stirring.
용해된 도프 용액을 스틸 밸트(제조원: BERNDORF; SUS 316에 크롬이 하드 코팅되어 있고(NICRO 22V), 표면에 요철이 있음(Ra: 7㎚, Rz: 100㎚)) 재질의 플레이트에 폭 50㎜의 어플리케이터를 사용하여 도포하였다.The dissolved dope solution was applied to a plate made of a steel belt (manufactured by BERNDORF; SUS 316 having chrome hard coated (NICRO 22V) and unevenness on the surface (Ra: 7 nm, Rz: 100 nm) Of an applicator.
이후, 일정 시간(스틸 밸트 공정 상의 박리시점)까지 측정 장비에 세팅한 상태로 건조시켰다.Thereafter, it was dried in a state where it was set on the measuring equipment until a predetermined time (peeling point in the steel belt process).
건조 이후, 필름을 로드 셀(Load Cell)에 연결한 후, 설정 스피드(speed)에 따라 플레이트를 전지하면서, 필름을 스틸 밸트(Steel belt)로부터 박리시켜, 이때의 박리력을 측정하였다.After drying, the film was connected to a load cell, and the film was peeled off from the steel belt while the plate was being wound according to the set speed, and the peeling force at this time was measured.
본 발명 박리력 측정에 사용된 측정 기기 및 측정 조건을 도 1에 도시하였고, 도 2에는 박리력 측정 과정 스킴(Scheme)을 나타내었다.The measuring instrument and measuring conditions used in the present invention are shown in FIG. 1, and FIG. 2 shows a peeling force measuring process scheme.
이렇게 박리력을 평가한 도프 용액을 각각 이용하여 필름을 제작한 후 연신 온도 175℃에서 130%로 연신하고, 건조온도 110℃ (40분)에서 필름을 건조하여 Axoscan 장비를 이용하여 리타데이션 값을 측정 하여 위상차 발현성을 평가하였다. 이때 필름 두께는 40㎛이었다.
The films were prepared using the dope solutions evaluated for peeling force, and then stretched to 130% at a stretching temperature of 175 ° C. The film was dried at a drying temperature of 110 ° C (40 minutes) and the retardation value was measured using an Axoscan apparatus And the expression of the retardation was evaluated. At this time, the film thickness was 40 mu m.
실시예 2Example 2
상기 실시예와 동일한 조건으로 필름을 제막하고 박리력을 측정 하였다.The film was formed on the same conditions as in the above examples, and the peeling force was measured.
셀룰로오스 아세테이트의 치환도는 (부틸기 치환도 0.24, 아세틸기 치환도 2.19, 하이드록시기 치환도 0.57)인 것을 사용하였다.
The substitution degree of cellulose acetate (butyl group substitution degree: 0.24, acetyl group substitution degree: 2.19, hydroxyl group substitution degree: 0.57) was used.
비교예Comparative Example 1~7 1 to 7
상기 실시예1에서 셀룰로오스 아세테이트의 치환도를 변경해 가며 사용한 점을 제외하고는, 모두 실시예와 동일한 방법으로 필름을 제막하고, 이의 박리력 및 위상차 발현성을 평가하였다.
A film was formed in the same manner as in Example 1 except that the degree of substitution of cellulose acetate was changed in Example 1 to evaluate the peeling force and the phase difference developing ability.
상기 실시예 1, 2, 및 비교예 1~7의 박리력 및 위상차 발현성을 평가 결과는 하기 표 1과 같았다.
The evaluation results of the peel strength and the phase difference developability of Examples 1 and 2 and Comparative Examples 1 to 7 were as shown in Table 1 below.
상기 평가 결과에서 보는 바와 같이, TAC 필름은 박리력은 우수하나 위상차 발현이 매우 낮고, DAC 필름은 위상차 발현은 좋으나 박리력이 매우 높아 스틸 밸트로부터 박리가 매우 어려워 강제적 peel off에 따른 필름의 벨트면상에 잔상 및 주름등의 품질 저하를 유발한다. 반면 실시예인 CAB 필름의 경우, 부틸기의 치환도가 0.1~0.3인 경우에는 박리력과 위상차 발현성이 모두 우수한 셀룰로오스 에스테르 필름인 것을 알 수 있다. 부틸기가 0.3 이상인 경우에는 박리력과 위상차 발현성이 우수하나 필름에서 심한 악취(Gingko odor)를 풍겨서 필름을 사용할 수가 없다. 부틸기가 0.1 이하인 경우에는 박리력 개선 효과가 미흡하다. Propionyl기의 경우는 Butyl기보다 화합물의 길이가 작아서 박리력을 개선하는 효과는 있으나 Butyl기 보다는 적다.
As can be seen from the above evaluation results, the TAC film exhibits excellent peeling force but exhibits a very low phase contrast. The DAC film exhibits a good retardation, but has a very high peeling force and is very difficult to peel off from the steel belt. Resulting in quality deterioration such as afterimage and wrinkles. On the other hand, in the case of the CAB film according to the embodiment, when the degree of substitution of the butyl group is 0.1 to 0.3, it is understood that the film is a cellulose ester film which is excellent in peel strength and phase retardation. When the butyl group is more than 0.3, the peeling force and the phase difference developability are excellent, but the film can not use the film due to the bad odor (Gingko odor) in the film. When the butyl group is 0.1 or less, the effect of improving the peeling force is insufficient. In the case of propionyl group, the compound length is smaller than that of butyl group, and it has the effect of improving the peeling force, but it is smaller than the Butyl group.
Claims (4)
식(1): 0.1≤X≤0.3
식(2): 0.3≤Y≤0.7
식(3): 1.0≤Z≤2.6
단, X는 부틸기의 치환 범위를 나타낸다. Y는 치환되지 않은 Hydroxyl기의 치환 범위이며, Z는 아세틸기와 프로피오닐기등 부틸기를 제외한 아실기의 치환 범위를 나타낸다.A cellulose ester film characterized by satisfying the following formulas (1) to (3).
(1): 0.1? X? 0.3
(2): 0.3? Y? 0.7
(3): 1.0? Z? 2.6
Provided that X represents the substitution range of the butyl group. Y is a substitution range of an unsubstituted hydroxyl group, and Z is a substitution range of an acyl group excluding a butyl group such as an acetyl group and a propionyl group.
식(5) Rth={(nx+ny)/2-nz}×d
식(6) Ro=(nx-ny)×d,
(단,d는 필름의 두께(nm), nx은 필름의 면내의 최대의 굴절율, ny은 필름 면내에서 nx에 직각인 방향의 굴절율, nz은 두께 방향에 있어서 필름의 굴절율이고, 각각 23℃, 55%RH의 환경하에서 파장 550nm로 측정한 값이다)The cellulose ester film according to claim 1, which satisfies a retardation of 90 to 300 nm in the thickness direction (Rth) and a retardation in the plane direction (Ro) of 40 to 200 nm expressed by the formulas (5) and (6).
(5) Rth = {(nx + ny) / 2-nz} xd
(6) Ro = (nx-ny) x d,
(Where d is the thickness of the film in nm), nx is the maximum refractive index in the plane of the film, ny is the refractive index in the direction perpendicular to nx in the film plane and nz is the refractive index of the film in the thickness direction, 55% < / RTI > RH)
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